"You always consider the source of that criticism," counters Bauer, who studied at Wellington's Victoria University a dozen years ago. "The people who felt we were exploiting the youngest character, it definitely came from a certain demographic, a certain type of audience member; more conservative."
Highlighting subjects and issues that discomfort people is among the most important to address. A lack of discomfort means the issue isn't contentious or has passed into acceptance by society. Sometimes, though, it takes a brave approach to stir the blood, even if Bauer and Gradus are simply reflecting what is in the culture already.
"It is sometimes like shooting the messenger," sighs Bauer. "A lot of people who have seen the film are exposed to information they didn't know. Parents freak out because they don't realise how much access kids have. If they're in denial they'll push away."
With documentaries having to compete with feature films for an audience, many American film-makers test-screen their work to see if it resonates or needs restructuring. It certainly helped Bauer and Gradus fine-tune their film, and prepare for the backlash.
"We had a test-screening that was heavily attended by feminists," says Gradus. "Some of the criticism we got was, 'My God! You're putting all this pornography in front of audiences, which is further damaging these poor women in these videos and further exploiting them for an exciting movie!'."
"Our stance was, 'Well, this is what anybody can go see. We're not showing you some niche thing that you have to search high and low for. You should know about it.'
"Maybe every parent should have a little gander, take a little tour, because mums especially don't have a clue."
The Documentary Edge Festival is at Auckland's Q Theatre until April 21. See documentaryedge.org.nz